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Basis of Presentation (Details) $ in Millions		3 Months Ended	9 Months Ended
	Jun. 04, 2020	Jan. 23, 2021 USD ($) company	Jan. 23, 2021 USD ($) company	Apr. 25, 2020 USD ($)
Variable Interest Entity [Line Items]
COVID-19 action and related cost, number of positions eliminated, percent	10.00%
COVID-19 action and related cost, costs incurred			$ 3.9
Non-operating income for wages and healthcare costs paid to employees		$ (5.2)
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Preferred share investments with common share warrant, number of privately-held companies | company		2	2
Line of Credit
Variable Interest Entity [Line Items]
Long-term line of credit				$ 75.0
Repayments of long-term lines of credit			$ 75.0

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- Definition

CARES Act, Non-Operating Income for Wages and Healthcare Costs Paid to Employees

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- Definition

COVID-19 Action and Related Cost, Costs Incurred

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- Definition

COVID-19 Action and Related Cost, Number of Positions Eliminated, Percent

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- Definition

The number of investments in privately-held companies in which the entity holds a warrant to purchase common shares.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03(16))
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-Name Accounting Standards Codification
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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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